CN112968502A - Equalizing module, battery management system and series module energy storage system - Google Patents
Equalizing module, battery management system and series module energy storage system Download PDFInfo
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- CN112968502A CN112968502A CN202110350171.7A CN202110350171A CN112968502A CN 112968502 A CN112968502 A CN 112968502A CN 202110350171 A CN202110350171 A CN 202110350171A CN 112968502 A CN112968502 A CN 112968502A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
Abstract
The embodiment of the application discloses balanced module, battery management system and series module energy storage system, balanced module is applied to series module energy storage system, series module energy storage system includes the electric core module of M series connections, and every electric core module is connected with a battery management unit, balanced module package switch module, power consumptive module and control module, control module is connected with switch module and battery management unit, control module is used for acquireing the battery state information that battery management unit exported, and export control signal to switch module according to battery state information, switch module is connected with power consumptive module and each electric core module, switch module is used for switching over the switch state based on control signal, with the connection status between control power consumptive module and the electric core module. Through the mode, the balance of the electric quantity among the battery modules can be realized by adopting a simpler structure, and the cost is lower.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an energy storage system with an equalization module and a series module.
Background
With the strong advocated smart power grid and the development of new energy in China, the configuration of the energy storage system in the aspects of micro-grid energy storage, wind-solar electric field electric energy smoothing, power grid regulation and the like is larger and larger, and the application effect is more in line with the application expectation. The energy storage system generally comprises a large number of energy storage units such as lithium batteries or super capacitors connected in series and parallel, wherein the energy storage system comprises battery modules connected in series.
In the energy storage system with the battery modules connected in series, the electric quantity among the battery modules in the energy storage system is usually unbalanced due to manufacturing process differences or attenuation differences in the use process. A common solution in the prior art is passive equalization, i.e. setting an onboard equalization resistance, and active equalization. However, the onboard balancing resistor has small balancing capability, so that the passive balancing has long balancing time, and the active balancing circuit has more complexity and higher cost.
Disclosure of Invention
The embodiment of the application aims at providing a balanced module and a series module energy storage system, which can realize the balance of electric quantity among battery modules by adopting a simpler structure and has lower cost.
In order to achieve the above object, in a first aspect, the present application provides an equalizing module, which is connected to a series module energy storage system, the series module energy storage system includes M series battery cell modules, and each battery cell module is connected to a battery management unit, where M is a positive integer greater than 1, and the equalizing module includes: the device comprises a switch module, a power consumption module and a control module; the control module is connected with the switch module and the battery management unit, and is used for acquiring the battery state information output by the battery management unit and outputting a control signal to the switch module according to the battery state information; the switch module is connected with the power consumption module and each battery cell module, and the switch module is used for switching a switch state based on the control signal so as to control the connection state between the power consumption module and the battery cell module.
In an optional manner, the balancing module further includes a communication module, and the communication module is connected with the control module and the battery management unit; the communication module is used for acquiring the battery state information output by the battery management unit and transmitting the battery state information to the control module.
In an optional manner, the switch module includes M groups of switches, and one group of switches is connected to one of the cell modules; each group of switches comprises a first switch and a second switch, one end of the first switch is connected with the anode of the battery cell module, the other end of the first switch is connected with the anode of the power consumption module, one end of the second switch is connected with the cathode of the battery cell module, and the other end of the second switch is connected with the cathode of the power consumption module.
In an alternative manner, the switch module includes a third switch, M-2 fourth switches, and a fifth switch; two ends of the third switch are respectively connected with the anode of the series module energy storage system and the anode of the power consumption module, and two ends of the fifth switch are respectively connected with the cathode of the series module energy storage system and the cathode of the power consumption module;
every two have the tie point between the electric core module, one fourth switch connects one the tie point, the fourth switch includes first sub-switch and second sub-switch, the first end of first sub-switch and the first end of second sub-switch all connect in the tie point, the second end of first sub-switch is connected the positive pole of power consumption module, the second end of second sub-switch is connected the negative pole of power consumption module.
In an alternative, the power consuming module comprises at least one of a power conversion unit or a load.
In an alternative form, the load comprises a resistive load;
the resistive load is connected to the switch module.
In an alternative, the battery state information includes at least one of voltage, current, temperature, internal resistance, and the like.
In an optional manner, the control module is specifically configured to:
determining a battery cell module needing to be balanced according to the battery state information;
and outputting a control signal to the switch module according to the battery cell module needing to be balanced.
In an optional manner, the determining, according to the battery state information, a cell module requiring equalization includes:
the battery state information output by each battery management unit is the voltage of the corresponding battery cell module, and the battery state information output by the battery management unit is the total voltage of each battery cell module;
calculating the ratio of the total voltage to the total number of the battery cell modules, and recording the ratio as a voltage average value;
calculating the difference value between the voltage of each battery cell module and the voltage average value;
determining whether there is at least one of said differences being greater than a first preset threshold,
if yes, determining the battery cell module corresponding to the difference value larger than the first preset threshold value as the battery cell module needing to be balanced.
In a second aspect, the present application provides a battery management system comprising the equalization module as described above.
In a third aspect, the present application provides a series module energy storage system, including M series-connected cell modules and the balancing module as described above;
the balancing module is connected with M battery cell modules connected in series, and is used for balancing the voltage of each battery cell module, wherein M is a positive integer greater than 1.
In an optional mode, the series module energy storage system further includes K battery management units, each battery management unit is connected to at least one of the battery cell modules, where K is a positive integer greater than 0;
and the battery management unit is used for transmitting the corresponding battery state information of the battery cell module to the balancing module.
The beneficial effects of the embodiment of the application are that: the application provides a balanced module, link to each other with series module energy storage system, series module energy storage system includes the electric core module of M series connection, and every electric core module is connected with a battery management unit, wherein, M is the positive integer that is greater than 1, balanced module includes the switch module, power consumption module and control module, control module and switch module and battery management unit are connected, control module is used for acquireing the battery state information that battery management unit exported, and export control signal to the switch module according to battery state information, the switch module is connected with power consumption module and electric core module, the switch module is used for switching over the on-off state based on control signal, with the connection state between control power consumption module and the electric core module, therefore, when the electric quantity is unbalanced between the battery module, control module then can switch over to switch on for the corresponding switch-on of the battery module that needs balanced through the battery state information output control signal of battery management unit output control signal The state to be connected the battery module that needs the equilibrium with power consumptive module, realized balancing the electric quantity of the battery module that needs the equilibrium, adopt a comparatively simple structure to realize the equilibrium of electric quantity between the battery module promptly, the cost is lower.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a series module energy storage system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a series module energy storage system according to another embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a series module energy storage system according to another embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a series module energy storage system according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a series module energy storage system according to another embodiment of the present disclosure;
fig. 6 is a flowchart of a method for controlling a switch module according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a series module energy storage system according to an embodiment of the present disclosure. As shown in fig. 1, the series module energy storage system includes a battery cell module a1 and a battery cell module a2 … battery cell module AM connected in series, that is, includes M battery cell modules and a balancing module 100 connected in series, where M is a positive integer greater than 1.
It should be understood that the balancing module 100 may be a module disposed in the series module energy storage system, or may be a separate module, and the balancing module 100 is connected to the series module energy storage system.
Specifically, the balancing module 100 is connected with the battery cell module a1 and the battery cell module a2 … battery cell module AM, and the balancing module 100 is used for balancing the voltage of each battery cell module. When the electric quantity between each electric core module of series connection is unbalanced (the capacity of battery is the variation in size) among the energy storage system, for example, in series connection module energy storage system, the electric core module appears and damages and changes new electric core module, and at this moment, the capacity of new and old electric core module is different, and the electric quantity is unbalanced promptly, then can lead to available capacity after the energy storage system constitutes the product to be less than the sum of the capacity of each electric core module, and the product capacity is lower promptly. Therefore, through setting up balanced module 100, it can be with the balanced processing of the battery cell module that needs different capacity sizes to make the electric quantity between each battery cell module maintain a comparatively balanced level.
In an embodiment, the series module energy storage system further includes K battery management units, and each battery management unit is connected to at least one cell module, where K is a positive integer greater than 0. Specifically, the battery management unit is used for transmitting the battery state information of the corresponding battery cell module to the balancing module, namely, the battery management unit can transmit the battery state information of the battery cell module connected with the battery management unit to the balancing module.
Wherein the battery state information includes at least one of voltage, current, temperature, internal resistance, and the like. That is, the battery management unit may detect the voltage, the current, the temperature, and the internal resistance of the cell module connected thereto, and transmit at least one of them to the balancing module.
Specifically, referring to fig. 1 again, the series module energy storage system includes a battery management unit B1 and a battery management unit B2 … battery management unit BK.
Wherein, battery management unit B1 is connected with electricity core module A1, and battery management unit B2 is connected … battery management unit BK with electricity core module A2 and is connected with electricity core module AM, and the electricity core module that battery management unit B1 corresponds is electricity core module A1 promptly, and the electricity core module that battery management unit B2 corresponds is electricity core module AM for electricity core module A2 … battery management unit BK corresponds. It can be seen that, in fig. 1, the battery management units and the battery cell modules are in a one-to-one correspondence relationship, that is, M is equal to K, and each battery management unit is connected with one battery cell module. At this time, the battery management unit B1 transmits the battery state information of the cell module a1 to the balancing module 100, and the battery management unit B2 transmits the battery state information of the cell module a2 to the balancing module 100 … and the battery management unit BK transmits the battery state information of the cell module AM to the balancing module 100.
It should be noted that, in other embodiments, the battery management unit may be connected to a plurality of battery cell modules, that is, the battery management unit and the battery cell modules are not in a one-to-one correspondence relationship. For example, as shown in fig. 2, the battery management unit B1 is connected to the cell module a1 and the cell module a2, and at this time, the battery management unit B1 may detect the battery state information of the cell module a1 and the cell module a2, and transmit the battery state information of the cell module a1 and the cell module a2 to the balancing module 100. It should be understood that K is smaller than M in fig. 2, i.e., the number of battery management units is smaller than the number of cell modules.
It should be noted that each cell module is connected to a battery management unit to transmit the battery state information of each cell module to the balancing module. When any two battery cell modules are not connected to the same battery management unit, the connection mode is the connection mode shown in fig. 1, and the battery management units correspond to the battery cell modules one to one; when two or more battery cell modules are connected to the same battery management unit, the connection mode shown in fig. 2 may be adopted, and the battery management units do not correspond to the battery cell modules one to one.
Referring to fig. 3 in conjunction with fig. 1, at this time, the battery management units correspond to the battery cell modules one to one. The balancing module 100 includes a switch module 10, a power consumption module 20 and a control module 30. The control module 30 is connected to the switch module 10 and each battery management unit, that is, the control module 30 is connected to the switch module 10, the battery management unit B1 and the battery management unit B2 …; switch module 10 is connected with power consumption module 20 and each electric core module, and switch module 10 is connected with power consumption module 20, electric core module A1, electric core module A2 … electricity core module AM promptly.
Specifically, the battery management unit B1 and the battery management unit B2 … acquire the battery state information of the cell module a1 and the cell module a2 … cell module AM respectively, and transmit the battery state information to the control module 30. After acquiring the battery state information of each battery cell module, the control module 30 outputs a control signal to the switch module 10 according to the battery state information. The switch module 10 switches the switch state according to the received control signal to control the connection state between the power consumption module 20 and each battery cell module. The switching state of the switch module 10 includes a conducting state and a disconnecting state, when the switching state of the switch module 10 is the conducting state, each battery cell module is in a connection state with the power consumption module 20, and at this time, each battery cell module can consume its electric quantity through the power consumption module 20; when the switching state of the switch module 10 is the off state, each battery cell module and the power consumption module 20 are in the off state.
In an embodiment, the switch module 10 includes M groups of switches, and one group of switches is connected to one cell module. As shown in fig. 4, each battery cell module is connected to two switches, which are a set of switches, that is, each set of switches includes a first switch S1 and a second switch S2. Wherein, the positive pole of every electric core module is connected with the one end of first switch S1, and the other end of first switch S1 then is connected to power consumptive module 20 'S anodal to and, the negative pole of every electric core module is connected with the one end of second switch S2, and the other end of second switch S2 is connected to power consumptive module 20' S negative pole, and then, two switches of being connected with same electric core module are a set of switch.
For example, the positive electrode of the cell module a1 is connected to one end of the first switch S1, the other end of the first switch S1 is connected to the positive electrode of the power consumption module 20, the negative electrode of the cell module a1 is connected to one end of the second switch S2, and the other end of the second switch S2 is connected to the negative electrode of the power consumption module 20.
In practical application, when a battery core module with a large electric quantity exists in each series-connected battery core module, then, the control module 30 acquires the battery state information of each battery core module through the battery management unit, that is, acquires at least one of voltage, current, temperature, internal resistance and the like of each battery core module, and the control module 30 can determine the battery core module with the large electric quantity. Then, the control module 30 may output a control signal to control a set of switches corresponding to the battery cell module with a large electric quantity in the switch module 10 to be turned on (i.e., turned on), so as to connect the battery cell module with the large electric quantity with the power consumption module 20, and consume the electric quantity through the power consumption module 20, thereby achieving balance of the electric quantity among all the battery modules.
For example, assume that the electric quantity of the cell module a1 is large, and the electric quantities of the other cell modules are the same and are all smaller than the electric quantity of the cell module a 1. At this time, if the battery state information acquired by the control module 30 is a voltage, then the control module 30 may determine that the electric quantity of the cell module a1 is too large (for example, the control module 30 may determine that the electric quantity of the cell module a1 is too large by comparing the acquired voltage), and at this time, the cell module a1 needs to be balanced. The control module 30 immediately outputs a control signal to control the switch corresponding to the cell module a1 in the switch module 10 to switch to a conducting state, i.e., to control the first switch S1 and the second switch S2 to be closed, the cell module a1 is connected with the power consumption module 20 and forms a power supply loop, and the cell module a1 consumes power through the power consumption module 20, so that the balancing process of the cell module a1 is completed.
In another embodiment, as shown in FIG. 5, the switch module 10 includes a third switch S3, M-2 fourth switches S4, and a fifth switch S5.
Two ends of the third switch S3 are respectively connected to the positive electrode of the series module energy storage system (i.e., the positive electrode of the whole battery cell modules after being connected in series) and the positive electrode of the power consuming module 20; both ends of the fifth switch S5 are respectively connected to the negative electrode of the series module energy storage system (i.e., the negative electrode of the whole battery cell module after series connection) and the negative electrode of the power consumption module 20. That is, one end of the third switch S3 is connected to the positive electrode of the cell module AM, and the other end of the third switch S3 is connected to the positive electrode of the power consumption module 20; one end of the fifth switch S5 is connected to the negative electrode of the cell module a1, and the other end of the fifth switch S5 is connected to the negative electrode of the power consuming module 20.
Meanwhile, because each cell module is sequentially connected in series, a connection point is arranged between every two cell modules, one fourth switch S4 is connected with one connection point, wherein each fourth switch S4 further comprises a first sub-switch S41 and a second sub-switch S42, the first end of the first sub-switch S41 and the first end of the second sub-switch S42 are both connected with the connection point, the second end of the first sub-switch S41 is connected with the anode of the power consumption module 20, and the second end of the second sub-switch is connected with the cathode of the power consumption module 20.
For example, a connection point P1 between the cell module a1 and the cell module a2 is connected to the fourth switch S4. The first end of the first sub-switch S41 and the first end of the second sub-switch S42 are both connected to the connection point P1, the second end of the first sub-switch S41 is connected to the positive electrode of the power consumption module 20, and the second end of the second sub-switch is connected to the negative electrode of the power consumption module 20.
In practical application, when a cell module with a large electric quantity exists in each series-connected cell module, if the positive electrode and the negative electrode of the cell module are respectively connected with one fourth switch S4, then, after the control module 30 determines the cell module with the large electric quantity, the control module 30 can output a control signal to control each of two fourth switches S4 corresponding to the cell module with the large electric quantity in the switch module 10 to be closed (and one of the two subswitches is the first subswitch S41, and the other is the second subswitch S42), so as to connect the cell module with the large electric quantity with the power consuming module 20, consume the electric quantity thereof through the power consuming module 20, and thus balance of the electric quantity among all the battery modules is realized.
For example, assume that the electric quantity of the cell module a2 is large, and the electric quantities of the other cell modules are the same and are all smaller than the electric quantity of the cell module a2, and the positive electrode and the negative electrode of the cell module a2 are respectively connected with a fourth switch S4. When the cell module a2 needs to be balanced, the control module 30 outputs a control signal to control the switch module 10 to switch the first sub-switch S41 of the fourth switch S4 connected to the positive electrode of the cell module a2 and the second sub-switch S42 of the fourth switch S4 connected to the negative electrode of the cell module a2 to the on state, that is, the first sub-switch S41 of the fourth switch S4 connected to the positive electrode of the cell module a2 and the second sub-switch S42 of the fourth switch S4 connected to the negative electrode of the cell module a2 are controlled to be closed, the cell module a2 is connected to the power consumption module 20 to form a power supply loop, the cell module a2 consumes power through the power consumption module 20, and thereby completing the balancing process of the cell module a 2.
If the positive pole of the great electric core module of electric quantity connects a fourth switch S4, and fifth switch S5 is connected to the negative pole, for example, electric core module A1, when needs are balanced to electric core module A1, control module 30 output control signal control fifth switch S5 and this fourth switch S4 'S first sub-switch S41 is closed, electric core module A1 is connected with power consumption module 20 and forms the power supply loop, electric core module A1 consumes power through power consumption module 20, thereby accomplish electric core module A1' S balanced process.
If the negative pole of the great cell module of electric quantity connects a fourth switch S4, and the positive pole is connected third switch S3, for example, cell module AM, when needs are balanced to cell module AM, control module 30 output control signal control third switch S3 and this fourth switch S4' S second sub-switch S42 is closed, cell module AM is connected with power consumption module 20 and forms the power supply circuit, cell module AM consumes power through power consumption module 20, thereby accomplish the balanced process of cell module AM.
Optionally, referring again to fig. 4, the power consuming module 20 comprises at least one of a power converting unit 21 or a load 22.
When the power consuming module 20 is the power converting unit 21, the positive pole and the negative pole of the power consuming module 20 are the positive pole and the negative pole of the power converting unit 21, that is, the positive pole and the negative pole of the power converting unit 21 are the 2 nd pin and the 1 st pin of the power converting unit 21, respectively.
Specifically, the power conversion unit 21 also needs to be connected to an electrical load (for example, a heat radiation fan) of the system. When at least one switch in the switch module 10 is turned off, the power conversion unit 21 can obtain the input voltage, and the power conversion unit 21 is configured to convert the input voltage into a supply voltage required by an electrical load of the system, so as to consume the input voltage on the electrical load of the system, thereby reducing the electric quantity of the battery cell module that needs to be balanced.
When the power consumption module 20 is a load 22, in an embodiment, the load 22 includes a resistive load (e.g., an incandescent lamp, etc.), and when at least one switch in the switch module 10 is closed, the resistive load can consume the input voltage, so as to reduce the power of the cell module that needs to be balanced.
When the power consuming module 20 includes the power converting unit 21 and the load 22, the specific implementation process thereof is only required by the above-mentioned embodiments, which is within the scope easily understood by those skilled in the art and will not be described herein again.
Optionally, the balancing module 100 further comprises a communication module 40, wherein the communication module 40 is connected to the control module 30 and each battery management unit, respectively, i.e. the communication module 40 is connected to the control module 30, the battery management unit B1, the battery management unit B2 …, and the battery management unit BK.
Specifically, the communication module 40 is configured to acquire battery status information output by each battery management unit and transmit the acquired battery status information to the control module 30.
Further, in an embodiment of the present application, the control module 30 may control the switch module by a method as shown in fig. 6, the method including:
601: and determining the battery cell module needing to be balanced according to the battery state information.
Wherein the battery state information includes at least one of voltage, current, temperature, internal resistance, and the like. In other words, the control module 30 can know the actual working state of each cell module by acquiring the voltage, current, temperature or internal resistance of each cell module. For example, if the control module 30 obtains the voltage of each cell module, the voltage of each cell module is compared with the voltage of the other cell module, so that the cell module with a larger voltage can be determined, and the control module 30 determines the cell module as the cell module needing to be balanced.
In an embodiment, the battery state information output by each battery management unit is a voltage of the corresponding cell module, and the battery state information output by each battery management unit is a total voltage of each cell module.
Specifically, after obtaining the total voltage, the control module 30 first calculates a ratio of the total voltage to the total number of the cell modules, and records the ratio as a voltage average value, then calculates a difference between the voltage of each cell module and the voltage average value, and finally determines whether at least one difference is greater than a first preset threshold, and if so, determines the cell module corresponding to the difference greater than the first preset threshold as the cell module requiring equalization.
Therefore, in the above manner, the cell modules with the voltages larger than the average voltage can be screened out to perform equalization processing, so that the difference between the voltage of each cell module after equalization processing and the average voltage value can be smaller than a first preset threshold value. The first preset threshold may be set according to an actual application, and is not limited herein.
602: and outputting a control signal to the switch module according to the battery cell module needing to be balanced.
After the cell modules needing to be balanced are screened out by the control module 30, a control signal is output to the switch module 10, so that the corresponding switches in the switch module 10 are closed, the cell modules needing to be balanced are connected to the power consumption module 20, the cell modules needing to be balanced supply power to the power consumption module, the voltage of the cell modules needing to be balanced is reduced, the corresponding switches are disconnected when the voltage of the cell modules needing to be balanced is reduced to a value which is smaller than a first preset threshold value and is equal to a voltage average value, and the process of balancing the cell modules needing to be balanced is completed.
It is to be understood that other manners may also be adopted to determine the cell module requiring equalization, which is not limited herein. For example, in another embodiment, the control module 30 may directly perform sorting according to the voltage magnitude, and determine the cell module corresponding to the voltage greater than the preset voltage value as the cell module requiring the balancing.
The embodiment of the application further provides a battery management system, and the battery management system comprises the balancing module in any one of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (12)
1. The utility model provides an equalizing module, its characterized in that links to each other with series module energy storage system, series module energy storage system includes the electric core module of M series connection, and every electric core module is connected with the battery management unit, and wherein, M is for being greater than 1 positive integer, equalizing module includes:
the device comprises a switch module, a power consumption module and a control module;
the control module is connected with the switch module and the battery management unit, and is used for acquiring the battery state information output by the battery management unit and outputting a control signal to the switch module according to the battery state information;
the switch module is connected with the power consumption module and each battery cell module, and the switch module is used for switching a switch state based on the control signal so as to control the connection state between the power consumption module and the battery cell module.
2. Equalizing module according to claim 1,
the balancing module further comprises a communication module, and the communication module is connected with the control module and the battery management unit;
the communication module is used for acquiring the battery state information output by the battery management unit and transmitting the battery state information to the control module.
3. Equalizing module according to claim 1 or 2,
the switch module comprises M groups of switches, and one group of switches is connected with one battery cell module;
each group of switches comprises a first switch and a second switch, one end of the first switch is connected with the anode of the battery cell module, the other end of the first switch is connected with the anode of the power consumption module, one end of the second switch is connected with the cathode of the battery cell module, and the other end of the second switch is connected with the cathode of the power consumption module.
4. Equalizing module according to claim 1 or 2,
the switch module comprises a third switch, M-2 fourth switches and a fifth switch;
two ends of the third switch are respectively connected with the anode of the series module energy storage system and the anode of the power consumption module, and two ends of the fifth switch are respectively connected with the cathode of the series module energy storage system and the cathode of the power consumption module;
every two have the tie point between the electric core module, one fourth switch connects one the tie point, the fourth switch includes first sub-switch and second sub-switch, the first end of first sub-switch and the first end of second sub-switch all connect in the tie point, the second end of first sub-switch is connected the positive pole of power consumption module, the second end of second sub-switch is connected the negative pole of power consumption module.
5. Equalizing module according to claim 1 or 2,
the power consuming module comprises at least one of a power conversion unit or a load.
6. The equalization module of claim 5,
the load comprises a resistive load;
the resistive load is connected to the switch module.
7. Equalizing module according to claim 1 or 2,
the battery state information includes at least one of voltage, current, temperature, internal resistance, and the like.
8. The equalization module of claim 7, wherein the control module is specifically configured to:
determining a battery cell module needing to be balanced according to the battery state information;
and outputting a control signal to the switch module according to the battery cell module needing to be balanced.
9. The balancing module of claim 8, wherein the determining the cell module requiring balancing according to the battery state information includes:
the battery state information output by each battery management unit is the voltage of the corresponding battery cell module, and the battery state information output by the battery management unit is the total voltage of each battery cell module;
calculating the ratio of the total voltage to the total number of the battery cell modules, and recording the ratio as a voltage average value;
calculating the difference value between the voltage of each battery cell module and the voltage average value;
determining whether there is at least one of said differences being greater than a first preset threshold,
if yes, determining the battery cell module corresponding to the difference value larger than the first preset threshold value as the battery cell module needing to be balanced.
10. A battery management system comprising a balancing module according to any of claims 1-9.
11. A series module energy storage system, comprising M series cell modules and the balancing module of any one of claims 1 to 9;
the balancing module is connected with M battery cell modules connected in series, and is used for balancing the voltage of each battery cell module, wherein M is a positive integer greater than 1.
12. The series module energy storage system of claim 11,
the series module energy storage system further comprises K battery management units, each battery management unit is connected with at least one battery cell module, and K is a positive integer larger than 0;
and the battery management unit is used for transmitting the corresponding battery state information of the battery cell module to the balancing module.
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